60
60
Sep 20, 2013
09/13
by
Ilka Agricola; Thomas Friedrich; Mario Kassuba
texts
eye 60
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Assume that the compact Riemannian spin manifold $(M^n,g)$ admits a $G$-structure with characteristic connection $\nabla$ and parallel characteristic torsion ($\nabla T=0$), and consider the Dirac operator $D^{1/3}$ corresponding to the torsion $T/3$. This operator plays an eminent role in the investigation of such manifolds and includes as special cases Kostant's ``cubic Dirac operator'' and the Dolbeault operator. In this article, we describe a general method of computation for lower bounds...
Source: http://arxiv.org/abs/math/0612304v1
"An Imposition Detected in Making Soda Water" is an article from The Belfast Monthly Magazine, Volume 13 . View more articles from The Belfast Monthly Magazine . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-30075497
Source: http://www.jstor.org/stable/10.2307/30075497
78
78
Jul 20, 2013
07/13
by
Ilka Agricola
texts
eye 78
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Sei G eine zusammenh\"angende reduktive komplexe algebraische Gruppe, die auf einer glatten affinen komplexen Variet\"at M wirke, und bezeichne $\Diff[G]{M}$ die G-invarianten algebraischen Differentialoperatoren auf M. Zerlegt man den Koordinatenring $\Aff{\C}{M}$ in G-isotypische Komponenten, so zeigen wir, da{\ss} die hierbei auftretenden Vielfachheitenr\"aume irreduzible $\Diff[G]{M}$-Moduln sind, zentralen Charakter haben und durch diesen eindeutig bestimmt sind....
Source: http://arxiv.org/abs/math/9906091v1
Topic: bub_upload
Source: http://books.google.com/books?id=NJzqOCG4Cm8C&hl=&source=gbs_api
51
51
Sep 17, 2013
09/13
by
Ilka Agricola; Thomas Friedrich
texts
eye 51
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For any triple $(M^n, g, \nabla)$ consisting of a Riemannian manifold and a metric connection with skew-symmetric torsion we introduce an elliptic, second order operator $\Omega$ acting on spinor fields. In case of a reductive space and its canonical connection our construction yields the Casimir operator of the isometry group. Several non-homogeneous geometries (Sasakian, nearly K\"ahler, cocalibrated $\mathrm{G}_2$-structures) admit unique connections with skew-symmetric torsion. We...
Source: http://arxiv.org/abs/math/0305233v2
91
91
Apr 24, 2016
04/16
by
Rudolf Agricola
texts
eye 91
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Topic: bub_upload
Source: http://books.google.com/books?id=m8Py4jxkqKQC&hl=&source=gbs_api
176
176
Aug 19, 2015
08/15
by
Birkenstock, Johann Melchior von, 1738-1809; Agricola, Karl Joseph Aloys, 1779-1852
texts
eye 176
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Birkenstock's memorial verse, in Latin and German and dated 1805, is illustrated with engravings by C. Agricola showing Canova's tomb for Maria Christine in the Augustinerkirche, Vienna
Topics: Canova, Antonio, 1757-1822, Maria Christine, consort of Albrecht Kasimir, Duke of Saxe-Teschen,...
82
82
Oct 26, 2014
10/14
by
Galderisi, Maurizio; Nistri, Stefano; Mondillo, Sergio; Losi, Maria-Angela; Innelli, Pasquale; Mele , Donato; Muraru, Denisa; D'Andrea, Antonello; Ballo, Piercarlo; Sgalambro, Aurelio; Esposito, Roberta; Marti, Giuliano; Santoro, Alessandro; Agricola, Eustachio; Badano, Luigi P; Marchioli, Roberto; Filardi, Pasquale Perrone; Mercuro, Giuseppe; Marino, Paolo Nicola
texts
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This article is from Cardiovascular Ultrasound , volume 9 . Abstract When applying echo-Doppler imaging for either clinical or research purposes it is very important to select the most adequate modality/technology and choose the most reliable and reproducible measurements. Quality control is a mainstay to reduce variability among institutions and operators and must be obtained by using appropriate procedures for data acquisition, storage and interpretation of echo-Doppler data. This goal can be...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3200147
57
57
Sep 18, 2013
09/13
by
Ilka Agricola; Ana Cristina Ferreira
texts
eye 57
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This paper is devoted to the first systematic investigation of manifolds that are Einstein for a connection with skew symmetric torsion. We derive the Einstein equation from a variational principle and prove that, for parallel torsion, any Einstein manifold with skew torsion has constant scalar curvature; and if it is complete of positive scalar curvature, it is necessarily compact and it has finite first fundamental group. The longest part of the paper is devoted to the systematic construction...
Source: http://arxiv.org/abs/1209.5886v2
Topic: bub_upload
Source: http://books.google.com/books?id=JwVA1abuSQEC&hl=&source=gbs_api
10
10.0
Jun 27, 2018
06/18
by
Ilka Agricola; Ana Cristina Ferreira; Reinier Storm
texts
eye 10
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comment 0
In this note, we describe the geometry of the quaternionic Heisenberg groups from a Riemannian viewpoint. We show, in all dimensions, that they carry an almost $3$-contact metric structure which allows us to define the metric connection that equips these groups with the structure of a naturally reductive homogeneous space. It turns out that this connection, which we shall call the canonical connection because of its analogy to the $3$-Sasaki case, preserves the horizontal and vertical...
Topics: Differential Geometry, Mathematics
Source: http://arxiv.org/abs/1503.08350
63
63
Sep 22, 2013
09/13
by
Ilka Agricola; Thomas Friedrich
texts
eye 63
favorite 0
comment 0
It is well-known that 7-dimensional 3-Sasakian manifolds carry a one-parametric family of compatible G_2 structures and that they do not admit a characteristic connection. In this note, we show that there is nevertheless a distinguished cocalibrated G_2 structure in this family whose characteristic connection along with its parallel spinor field can be used for a thorough investigation of the geometric properties of 7-dimensional 3-Sasakian manifolds. Many known and some new properties can be...
Source: http://arxiv.org/abs/0812.1651v1
4
4.0
Jun 29, 2018
06/18
by
Ilka Agricola; Ana Cristina Ferreira
texts
eye 4
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comment 0
Given a compact Lie group $G$ with Lie algebra $\mathfrak{g}$, we consider its tangent Lie group $TG\cong G\ltimes_{\mathrm{Ad}} \mathfrak{g}$. In this short note, we prove that $TG$ admits a left-invariant naturally reductive Riemannian metric $g$ and a metric connection with skew torsion $\nabla$ such that $(TG,g,\nabla)$ is naturally reductive. An alternative spinorial description of the same connection on the direct product $G\times \mathfrak{g}$ generalizes in a rather subtle way to...
Topics: Differential Geometry, Mathematics
Source: http://arxiv.org/abs/1603.06211
2
2.0
Mar 2, 2021
03/21
by
Luther-Agricola-Seura
texts
eye 2
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v. 23cm
Topic: Luther, Martin, 1483-1546 -- Theology
1
1.0
Jan 22, 2019
01/19
by
Banco Agricola Hipotecario
texts
eye 1
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comment 0
15 pg
Topic: Economia Guatemala
Source: Este libro es la donacion de Juan Jose Falla , que recibio la Universidad Francisco Marroquin
3
3.0
Jun 30, 2018
06/18
by
Ilka Agricola; Simon G. Chiossi; Thomas Friedrich; Jos Höll
texts
eye 3
favorite 0
comment 0
We present a uniform description of $\mathrm{SU}(3)$-structures in dimension $6$ as well as $G_2$-structures in dimension $7$ in terms of a characterising spinor and the spinorial field equations it satisfies. We apply the results to hypersurface theory to obtain new embedding theorems, and give a general recipe for building conical manifolds. The approach also enables one to subsume all variations of the notion of a Killing spinor.
Topics: Mathematics, Mathematical Physics, Differential Geometry
Source: http://arxiv.org/abs/1411.5663
2
2.0
Jun 30, 2018
06/18
by
Ilka Agricola; Ana Cristina Ferreira; Thomas Friedrich
texts
eye 2
favorite 0
comment 0
We present a new method for classifying naturally reductive homogeneous spaces -- i.\,e.~homogeneous Riemannian manifolds admitting a metric connection with skew torsion that has parallel torsion \emph{and} curvature. This method is based on a deeper understanding of the holonomy algebra of connections with parallel skew torsion on Riemannian manifolds and the interplay of such a connection with the geometric structure on the given Riemannian manifold. It allows to reproduce by easier arguments...
Topics: Mathematics, Representation Theory, Differential Geometry
Source: http://arxiv.org/abs/1407.4936
38 pg
Topic: Economia, Guatemala
Source: Este libro es la donacion de Juan Jose Falla , que recibio la Universidad Francisco Marroquin
8
8.0
Jun 21, 2019
06/19
by
Agricola, Erhard
texts
eye 8
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127 p. --
Topics: German language -- Semantics, Semantics
68
68
Sep 24, 2013
09/13
by
I. Agricola; T. Friedrich; P. -A. Nagy; C. Puhle
texts
eye 68
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Let $\nabla$ be a metric connection with totally skew-symmetric torsion $\T$ on a Riemannian manifold. Given a spinor field $\Psi$ and a dilaton function $\Phi$, the basic equations in type II B string theory are \bdm \nabla \Psi = 0, \quad \delta(\T) = a \cdot \big(d \Phi \haken \T \big), \quad \T \cdot \Psi = b \cdot d \Phi \cdot \Psi + \mu \cdot \Psi . \edm We derive some relations between the length $||\T||^2$ of the torsion form, the scalar curvature of $\nabla$, the dilaton function...
Source: http://arxiv.org/abs/hep-th/0412127v1
15 p.
Topic: Guatemala - Economía - Bancos
Source: Este libro es parte de la Donación Roxana María Ávila, que recibió la Universidad Francisco Marroquín
19 p.
Topic: Guatemala - Economía - Bancos
Source: Este libro es parte de la Donación Roxana María Ávila, que recibió la Universidad Francisco Marroquín
202
202
Feb 4, 2016
02/16
by
Georg Agricola
texts
eye 202
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=av4peuMLpVoC&hl=&source=gbs_api
141
141
Jul 28, 2016
07/16
by
Franz Agricola
texts
eye 141
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=Ici_hIxrcvwC&hl=&source=gbs_api
51
51
Sep 18, 2013
09/13
by
Ilka Agricola; Thomas Friedrich
texts
eye 51
favorite 0
comment 0
We study geometric structures of $\mathcal{W}_4$-type in the sense of A. Gray on a Riemannian manifold. If the structure group $\mathrm{G} \subset \SO(n)$ preserves a spinor or a non-degenerate differential form, its intrinsic torsion $\Gamma$ is a closed 1-form (Proposition \ref{dGamma} and Theorem \ref{Fixspinor}). Using a $\mathrm{G}$-invariant spinor we prove a splitting theorem (Proposition \ref{splitting}). The latter result generalizes and unifies a recent result obtained in...
Source: http://arxiv.org/abs/math/0509147v1
117
117
Jan 22, 2015
01/15
by
Georg Agricola
texts
eye 117
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=9pxPAAAAcAAJ&hl=&source=gbs_api
Topic: bub_upload
Source: http://books.google.com/books?id=QpkTCbnzAeoC&hl=&source=gbs_api
63
63
Sep 18, 2013
09/13
by
Ilka Agricola
texts
eye 63
favorite 0
comment 0
This review article intends to introduce the reader to non-integrable geometric structures on Riemannian manifolds and invariant metric connections with torsion, and to discuss recent aspects of mathematical physics--in particular superstring theory--where these naturally appear. Connections with skew-symmetric torsion are exhibited as one of the main tools to understand non-integrable geometries. To this aim a a series of key examples is presented and successively dealt with using the notions...
Source: http://arxiv.org/abs/math/0606705v1
Topic: bub_upload
Source: http://books.google.com/books?id=zLN9YnZx6DMC&hl=&source=gbs_api
University of Toronto - Robarts Library
839
839
Jul 19, 2010
07/10
by
Maryland Geological Survey; Abbe, Cleveland, 1838-1916; O'Harra, Cleophas C. (Cleophas Cisney), 1866-1935; Clark, William B; Dorsey, Clarence W; Fassig, Oliver L. (Oliver Lanard), 1860-1936; Newell, Frederick Haynes, 1862-1932; Bauer, L. A. (Louis Agricola), 1865-1932; Sudworth, George B; Merriam, C. Hart (Clinton Hart), 1855-1942; Preble, Edward A. (Edward Alexander), 1871-1957
texts
eye 839
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"The present volume on Allegany County inaugurates a new series of reports dealing with the physical features of the several counties of Maryland." -- Preface
Topics: Geology, Mines and mineral resources, Physical geography, Forests and forestry
68
68
Oct 25, 2014
10/14
by
Tozzi, Alberto E; Mingarelli, Rita; Agricola, Eleonora; Gonfiantini, Michaela; Pandolfi, Elisabetta; Carloni, Emanuela; Gesualdo, Francesco; Dallapiccola, Bruno
texts
eye 68
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This article is from Orphanet Journal of Rare Diseases , volume 8 . Abstract Background: The use of the Internet for searching and sharing health information and for health care interactions may have a great potential for families of children affected with rare diseases. We conducted an online survey among Italian families of patients with rare diseases with the objective to describe their Internet user profile, and to explore how Internet use affects their health decisions. Methods: All...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3662591
198
198
Oct 27, 2014
10/14
by
Agricola, Georg
texts
eye 198
favorite 1
comment 0
172
172
May 10, 2016
05/16
by
Georg Agricola
texts
eye 172
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=SwvxKAm0GicC&hl=&source=gbs_api
44
44
Sep 22, 2013
09/13
by
Ilka Agricola; Thomas Friedrich; Jos Höll
texts
eye 44
favorite 0
comment 0
The present article investigates Sp(3) structures on 14-dimensional Riemannian manifolds, a continuation of the recent study of manifolds modeled on rank two symmetric spaces (here: SU(6)/Sp(3)). We derive topological criteria for the existence of such a structure and construct large families of homogeneous examples. As a by-product, we prove a general uniqueness criterion for characteristic connections of G structures and that the notions of biinvariant, canonical, and characteristic...
Source: http://arxiv.org/abs/1210.3056v1
32p. Ag. 3, 1929.
Topic: Guatemala - Préstamos hipotecarios
Fondo Antiguo de la Universidad de Sevilla
244
244
Apr 21, 2017
04/17
by
Caton, Dionisio; Nebrija, Antonio de, 1444-1522; Erasmus, Desiderius, 1467-1536; Esopo. Fabulae; Verulamio, Sulpicio; Agricola, Rudolf. Isocratis Parenaesis; Nebrija, Sebastián; Nebrija, Sancho de
texts
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Más detalles PUBLICACIÓN Apvd inclytam Granatam : [S.n.], 1553 DESCR. FÍSICA [82] h. ; 4º NOTA A PUBLIC. Datos de pie de imp. tomados del colofón, repetido al final de los Catonis disticha moralia, las Aesopi fabulae y el Floretus (en la port. consta solamente la fecha de imp.). -- Marca tip. de los mismos imp. en h. c12v. CONTIENE Contiene: Catonis disticha moralia (a1 r.-b1 v.). -- Dicta sapientum / Periandri Corinthii (b2 r.-b5 r.). -- Sequuntur Mimi Publiani (b5 r.-b8 v.). -- Aliquot...
Topics: Fondo Antiguo, Libros del Siglo XVI, Antigüedad, Filosofía
272
272
Dec 4, 2014
12/14
by
Rudolf Agricola
texts
eye 272
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=jT-PZ8uACO0C&hl=&source=gbs_api
494
494
Dec 3, 2014
12/14
by
Georg Agricola
texts
eye 494
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=jqWM9QXzvaUC&hl=&source=gbs_api
242
242
Nov 13, 2014
11/14
by
Rudolf Agricola
texts
eye 242
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=6Uz8jSn7cwUC&hl=&source=gbs_api
Duke University Libraries
1,470
1.5K
Feb 22, 2011
02/11
by
Agricola, Rodolphus, 1443?-1485; Phrissemius, Joannes Matthaeus
texts
eye 1,470
favorite 0
comment 0
At head of title: Rodolphi Agricolae phrisij
Topic: Dialectic
California Digital Library
3,306
3.3K
Sep 18, 2008
09/08
by
Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964
texts
eye 3,306
favorite 4
comment 0
Bibliography: p. 599-606
Topics: Metallurgy, Mineral industries
370
370
Dec 17, 2014
12/14
by
Georg Agricola
texts
eye 370
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=s65BrzQ-1i0C&hl=&source=gbs_api
Imprint from colophon; place of publication follows the imprint date in the colophon
58
58
Sep 18, 2013
09/13
by
Ilka Agricola
texts
eye 58
favorite 0
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Given a reductive homogeneous space M=G/H endowed with a naturally reductive metric, we study the one-parameter family of connections joining the canonical and the Levi-Civita connection (t=0, 1/2). We show that the Dirac operator D^t corresponding to t=1/3 is the so-called ``cubic'' Dirac operator recently introduced by B. Kostant, and derive the formula for its square for any t, thus generalizing the classical Parthasarathy formula on symmetric spaces. Applications include the existence of a...
Source: http://arxiv.org/abs/math/0202094v1
Biodiversity Heritage Library
676
676
Jul 6, 2009
07/09
by
Maryland. Geological Survey, 1896-; Shattuck, George Burbank, b. 1869; Bonsteel, Jay Allan, 1873-; Von Herrmann, Charles F; Grover, Nathan Clifford, 1868-; Bauer, L. A. (Louis Agricola), 1865-1932; Meil, Clayton Dissinger; Miller, Benjamin L. (Benjamin LeRoy), 1874-1944
texts
eye 676
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Wm. Bullock Clark, state geologist
Topic: Geology
Bibliothèque interuniversitaire de Santé
281
281
Georgii Agricolae De ortu & causis subterraneorum, lib. V. De natura eorum quæ effluunt ex terra, lib. IIII. De natura fossilium, lib. X. De ueteribus & nouis metallis, lib. II. Bermannus, siue De re metallica dialogus, lib. I. Interpretatio Germanica vocum rei metallicæ, addito duplici indice, altero rerum, altero locorum. Omnia ab ipso authore, cum haud pœnitenda acessione, recens recognita.
Mar 3, 2018
03/18
by
Agricola, Georg
texts
eye 281
favorite 0
comment 0
Ex-dono "Magistri Ph. Nicolai Pia 1765" (i.e Philippe-Nicolas Pia) au contre-plat. Available at the Bibliothèque interuniversitaire de santé (Paris). See this resource in Medica digital library : pharma_res005374 .
Topic: Bibliothèque du Collège de pharmacie
31
Topic: Monastic and religious life of women
Topics: Pieces, For 3 instruments, Scores with open instrumentation, For 3 players, For 3 voices, For...
Source: http://imslp.org/wiki/Si_dedero_(Agricola,_Alexander)
5
5.0
Jun 28, 2018
06/18
by
Ilka Agricola; Margarita Kraus
texts
eye 5
favorite 0
comment 0
The present note deals with the properties of metric connections $\nabla$ with vectorial torsion $V$ on semi-Riemannian manifolds $(M^n,g)$. We show that the $\nabla$-curvature is symmetric if and only if $V^{\flat}$ is closed, and that $V^\perp$ then defines an $(n-1)$-dimensional integrable distribution on $M^n$. If the vector field $V$ is exact, we show that the $V$-curvature coincides up to global rescaling with the Riemannian curvature of a conformally equivalent metric. We prove that it...
Topics: Differential Geometry, Mathematics
Source: http://arxiv.org/abs/1509.08944
286
286
Nov 19, 2014
11/14
by
Franz Agricola
texts
eye 286
favorite 0
comment 0
Topic: bub_upload
Source: http://books.google.com/books?id=BmgAJKXAgwoC&hl=&source=gbs_api
